We studied the relationship between flower size and nectar properties of hummingbird-visited flowers in the Brazilian Atlantic Forest. We analysed the nectar volume and concentration as a function of corolla length and the average bill size of visitors for 150 plant species, using the phylogenetic generalized least squares (PGLS) to control for phylogenetic signals in the data. We found that nectar volume is positively correlated with corolla length due to phylogenetic allometry. We also demonstrated that larger flowers provide better rewards for long-billed hummingbirds. Regardless of the causal mechanisms, our results support the hypothesis that morphological floral traits that drive partitioning among hummingbirds correspond to the quantity of resources produced by the flowers in the Atlantic Forest. We demonstrate that the relationship between nectar properties and flower size is affected by phylogenetic constraints and thus future studies assessing the interaction between floral traits need to control for phylogenetic signals in the data.

Data on corolla length, nectar volume and concentration and sources for 150 hummingbird-pollinated plant species in the Brazilian Atlantic rain forest. Reference = sources of data: Buzato et al. (2000) (a), Sazima & Sazima (1999) (b), Rocca-de-Andrade (2006) (c), Lopes (2002) (d), Lenzi et al. (2006) (e), Filho & Machado (2001) (f), Coelho (2013) (g), Canela (2006) (h), Fonseca (2007) (i), Galetto et al. (2000) (j), Machado & Semir (2006) (k), Mendonça & Anjos (2006) (l), Sigrist & Sazima (2002) (m), Sanmartin-Gajardo & Sazima (2005) (n), Rocca & Sazima (2008) (o), Canela & Sazima (2003) (p).

Supplement to: Tavares, Davi Castro; Freitas, Leandro; Gaglianone, Maria Cristina (2016): Nectar volume is positively correlated with flower size in hummingbird-visited flowers in the Brazilian Atlantic Forest. Journal of Tropical Ecology, 32(04), 335-339